The meeting lasted a total of three days.
During these three days, the three civilizations established a set of alliance rules and made clear the division of various functions.
In terms of military scheduling and logistical resources, the three civilizations formed a United Military Department for intelligence exchange and resource allocation.
Specific military movements were handled by the Staff Department of the United Military Department. The staff officers were chosen from World Masters selected by the three civilizations.
Yes, the staff officers in the United Command had already been elevated to World Master.
This wasn't because the Staff Department didn't have Level 3 Creatures, but because these creatures were all part of the think tank for the staff officers and not directly involved in decision-making.
